The above changelog is the one of the previous buid so follow this one :
Second part of Sisyphelly Route.
After triggering the Winter's Glee event, go to White Dough to trigger it.
i can't remember the exact order of how to unlock it but if you are blocked, start a new game and follow the order of the updates, starting from the first to the last. In this order you'll get to see all CGs if you make the right choices and eventually you'll get to the point where you bring back Darius to white dough.
I say follow the order of the updates and you'll see all the available content of the game. Good luck